XAFS研究铱系氧化物电极的精细结构与性能

XAFS研究铱系氧化物电极的精细结构与性能摘要：本文采用X射线吸收精细结构（XAFS）技术研究了铱系氧化物电极的精细结构与性能。通过样品制备、实验测量和数据处理，获得了铱系氧化物电极的XAFS谱图和相应的边缘振荡特征。使用反演算法分析了XAFS谱图，得到了铱系氧化物电极的晶格结构参数和原子间距离，并探讨了这些结构参数与电极表面性质之间的关系。我们发现，铱系氧化物电极的晶格结构参数与电极的电催化活性有着密切的联系，确定了一些关键参数对铱系氧化物电极的性能起到了决定性作用。这项结果对于研究铱系氧化物电极的化学和物理性质，以及开发高效的电极材料和电化学催化剂具有重要意义。

关键词：XAFS；铱系氧化物电极；精细结构；性能；电催化活性

本文的英文翻译：

Title:XAFSstudyonthefinestructureandperformanceofiridium-basedoxideelectrodes

Abstract:Thispaperinvestigatesthefinestructureandperformanceofiridium-basedoxideelectrodesusingX-rayabsorptionfinestructure(XAFS)technology.Bypreparingsamples,conductingexperimentalmeasurementsandprocessingdata,theXAFSspectraandtheircorrespondingedgeoscillationfeaturesofiridium-basedoxideelectrodesareobtained.TheinversionalgorithmisusedtoanalyzetheXAFSspectratoobtainthelatticestructureparametersandatomicdistancesofiridium-basedoxideelectrodes,andtoexploretherelationshipbetweenthesestructuralparametersandelectrodesurfaceproperties.Wefindthatthelatticestructureparametersofiridium-basedoxideelectrodesarecloselyrelatedtotheelectrocatalyticactivityoftheelectrodes,andthatcertainkeyparametersplayadecisiveroleintheperformanceofiridium-basedoxideelectrodes.Theseresultsareofgreatsignificanceforstudyingthechemicalandphysicalpropertiesofiridium-basedoxideelectrodes,aswellasfordevelopingefficientelectrodematerialsandelectrochemicalcatalyticagents.

Keywords:XAFS;iridium-basedoxideelectrode;finestructure;performance;electrocatalyticactivitIridium-basedoxideelectrodeshavebeenextensivelystudiedduetotheirexcellentelectrocatalyticactivityandstability,makingthemsuitableforvariouselectrochemicalapplications,includingwatersplitting,fuelcells,andelectrolysis.TheXAFStechniqueprovidesvaluableinsightsintothelocalstructureofthesematerials,whichcontributessignificantlytotheirelectrocatalyticperformance.

TheXAFSanalysisrevealedthatiridium-basedoxideelectrodesexhibitamixedvalencestate,andtheformationofIr-O-Irbondsiscrucialfortheirelectrocatalyticactivity.Thefinestructureanalysisshowedthatthecoordinationnumberoftheiridiumatomsintheoxideelectrodeis6,indicatingthatiridiumhasanoctahedralcoordinationgeometry.Furthermore,theXAFSstudyhighlightedtheimportanceofthesurfaceandbulkcoordinationenvironmentfortheelectrocatalyticactivityoftheseelectrodes.

Interestingly,theXAFSanalysisalsorevealedthattheelectrocatalyticperformanceofiridium-basedoxideelectrodesisaffectedbycertainkeyparameters,includingthecrystalstructure,thedegreeofdisorder,andthemorphologyofthematerials.Specifically,anincreaseindisorderinthecrystalstructureandtheformationofdefectsandvacanciesarefoundtoenhancetheelectrocatalyticactivityoftheseelectrodes.Additionally,anincreaseinthesurfaceareaandporosityoftheelectrodeswasobservedtoimprovetheirelectrocatalyticperformance.

Inconclusion,theXAFStechniqueisapowerfultoolforstudyingthelocalstructureofiridium-basedoxideelectrodes,anditsfindingshaveprovidedvaluableinsightsintotheelectrocatalyticactivityofthesematerials.Theresultsaresignificantforthedevelopmentofmoreefficientelectrodematerialsandelectrochemicalcatalyticagents,whichareessentialforfacilitatingthetransitiontoasustainableandgreenenergyeconomyInadditiontoXAFS,othertechniqueshavebeenusedtostudythestructureandperformanceofiridium-basedoxideelectrodes.Forexample,X-rayphotoelectronspectroscopy(XPS)hasbeenusedtoinvestigatetheelementalcompositionandoxidationstateofthesurfaceofiridium-basedoxideelectrodes.XPSresultshaveshownthatthesurfaceoftheoxideelectrodescanbemodifiedbychangingtheannealingtemperatureorbydopingwithotherelements,suchasscandium,toenhancetheircatalyticactivity.

Anothertechniquethathasbeenusedtostudytheelectrochemicalpropertiesofiridium-basedoxideelectrodesiselectrochemicalimpedancespectroscopy(EIS).EISmeasurestheimpedanceofasystemasafunctionoffrequency,whichprovidesinformationonthechargetransferresistance,doublelayercapacitance,andthediffusioncoefficientofionsintheelectrode.EIShasbeenusedtostudytheeffectofelectrodepreparationontheelectrochemicalpropertiesofiridium-basedoxideelectrodes.

Inaddition,scanningelectronmicroscopy(SEM)hasbeenusedtostudythemorphologyofiridium-basedoxideelectrodes.SEMimageshaveshownthatthemorphologyoftheelectrodescanbecontrolledbychangingtheannealingtemperatureandthecalcinationatmosphere.Ithasbeenfoundthattheactivesitesfortheelectrochemicalreactionarelocatedontheedgesandcornersoftheiridium-basedoxidenanoparticles.

Overall,theuseofvarioustechniques,includingXAFS,XPS,EIS,andSEM,hasprovidedvaluableinsightsintothestructureandperformanceofiridium-basedoxideelectrodes.Theresultsobtainedfromthesestudieshaveimplicationsforthedesignandoptimizationofelectrochemicalenergyconversionandstoragedevices,suchasfuelcells,batteries,andsupercapacitors.

Inconclusion,thedevelopmentofefficient,stable,andcost-effectiveelectrocatalystsforelectrochemicalenergyconversionandstorageisessentialforthetransitiontoasustainableandgreenenergyeconomy.Theuseofadvancedtechniques,suchasXAFS,XPS,EIS,andSEM,providesapowerfultoolforstudyingthestructureandperformanceofelectrocatalysts,suchasiridium-basedoxideelectrodes.TheresultsobtainedfromthesestudiesprovidevaluableinsightsandguidanceforthedesignandoptimizationofelectrochemicaldevicesforenergyconversionandstorageInrecentyears,theimportanceofelectrochemicalenergyconversionandstoragehasbecomeincreasinglyclearduetotheurgentneedforasustainableandgreenenergyeconomy.Electrochemicaldevices,suchasfuelcells,electrolyzers,andbatteries,offerapromisingsolutionforenergystorageandconversionastheyhavehighenergydensity,longcyclelife,andlowemissions.However,tofullyrealizethepotentialofthesesystems,itisessentialtodevelophighlyefficientandstableelectrocatalysts.

Electrocatalystsarematerialsthatenhancetherateofelectrochemicalreactionsbyprovidingapathwayforchargetransferbetweenelectrodesandelectrolytes.Theperformanceofelectrocatalystsishighlydependentontheirchemicalcomposition,morphology,andstructure.Therefore,itiscrucialtostudythestructure-performancerelationshipofelectrocatalyststodesignandoptimizeelectrochemicaldevicesforenergyconversionandstorage.

X-rayAbsorptionFineStructure(XAFS)isapowerfulspectroscopictechniquethatcanrevealthelocalatomicstructurearoundaspecificelement.XAFSprovidesvaluableinformationonthecoordinationnumber,bondlength,andbondangle,whichareessentialparametersforunderstandingthecatalyticactivityandstabilityofelectrocatalysts.X-rayPhotoelectronSpectroscopy(XPS)isanothercriticaltechniqueforcharacterizingthesurfacechemistryandelectronicstructureofelectrocatalysts.XPScanidentifytheoxidationstateandchemicalbondingoftheelementspresentatthesurfaceoftheelectrocatalyst,whichcanbecorrelatedwithitscatalyticactivity.

ElectrochemicalImpedanceSpectroscopy(EIS)isawidelyusedtechniqueforstudyingthekineticsofelectrochemicalreactionsinreal-time.EISmeasurestheresistanceofasystemtosmallamplitudeperturbationsintheappliedvoltage,providinginformationonthechargetransferresistanceandtheelectrochemicalimpedanceofthesystem.EIScanbeusedtodeterminetheelectrochemicalreactionmechanismandrate-limitingsteps,whicharecriticalforthedesignandoptimizationofelectrocatalysts.

ScanningElectronMicroscopy(SEM)isavaluabletoolforimagingandcharacterizingthemorphologyandsurfacetopographyofelectrocatalysts.SEMcanprovidehigh-resolutionimagesoftheelectrocatalystsurface,whichcanbeusedtoidentifythesize,shape,anddistributionoftheparticles.Additionally,SEMcanbeusedtoinvestigatetheporosityandroughnessoftheelectrocatalystsurface,whichcanhaveasignificantimpactonitscatalyticactivityandstability.

Inconclusion,theuseofadvancedtechniques,suchasXAFS,XPS,EIS,andSEM,providesapowerfultoolforstudyingthestruc